Figure 1

Maps of walleye sampling sites (lettered, corresponding to locations in Table 1and Additional file10). A Distribution across North America (modified from Billington et al. [25]), depicting genetic discontinuities among contemporary walleye spawning groups from Barrier v2.2 analysis [26], with black box denoting area of close-up study for B Lake Erie, with historic collections of walleye (labeled Q) and “blue pike” (R). Maps were created by us with ArcGIS® software by Esri (Redlands, CA).